This is a chemistry one but I cant get into it, can someone help me balance an equation?

Question

isaiah.feynman · Answer

Okay.

anonymous · Answer

$$Al _{2}O _{3} + HCl \rightarrow AlCl _{3} + H _{2}O$$
So when I start to balance it is goes
                  2-Al-3
                  3-O-1
                 1-H-2
                 1-Cl-3
How can i finish it?

isaiah.feynman · Answer

attachment

anonymous · Answer

Can you put the work down too please so I can understand how in the world that works

isaiah.feynman · Answer

Sorry, balancing of equation is a trial and error thing. There is no straight solution.

anonymous · Answer

okay and can i get help with another? 
$$H _{2}O_{2}\rightarrow H_{2}O+O_{2}$$
                         2 -H-2
                         2-O-3